Baldor MN1928 installation manual Troubleshooting, Symptom, Check

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Symptom	Check
Motor runs	Verify that the backplane (if used) and drive are correctly grounded
uncontrollably when	to a common ground point.
controller is switched
on.	(Servo outputs only) Check that the correct encoder feedback signal
	is connected to the encoder input, the encoder has power (if
	required, see section 5.2.11) and is functioning correctly.
	Check that the drive is connected correctly to the NextMove ES and
	that with zero demand there is 0V at the drive’s demand input. See
	section 6.5.1.
Motor runs	(Servo outputs only) Check that the encoder feedback signal(s) are
uncontrollably when	connected to the correct encoder input(s). Check the demand to the
controller is switched	drive is connected with the correct polarity.
on and servo loop
gains are applied or	Check that for a positive demand signal, a positive increase in axis
when a move is set	position is seen. The ENCODERMODE keyword can be used to
in progress. Motor	change encoder input direction. The DACMODE keyword can be
then stops after a	used to reverse DAC output polarity.
short time.	Check that the maximum following error is set to a reasonable
	value. For setting up purposes, following error detection may be
	disabled by setting FOLERRORMODE = 0.
Motor is under	(Servo outputs only) Servo loop gains may be set incorrectly. See
control, but vibrates	sections 6.5.2 to 6.7.
or overshoots during
a move.
Motor is under	Verify that the backplane and drive are correctly grounded to a
control, but when	common ground point.
moved to a position
and then back to the	(Servo outputs only) Using an oscilloscope at the backplane
start it does not	connectors, check:
return to the same
position.	H All encoder channels are free from electrical noise;
	H They are correctly wired to the controller;
	H When the motor turns, the two square wave signals are
	90 degrees out of phase. Also check the complement
	signals.
	Ensure that the encoder cable uses shielded twisted pair cable, with
	the outer shield connected at both ends and the inner shields
	connected only at the NextMove ES end.
	(Stepper outputs only) The motor is not maintaining synchronization
	with the NextMove ES drive output signals due to excessive
	acceleration, speed or load demands on the motor.
	Check that the acceleration, speed and load are within the
	capabilities of the motor.

MN1928 Troubleshooting 7-5